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Consider the space R∆ of rational functions of r variables with poles on an arrangement of hyperplanes ∆. It is important to study the decomposition of the space R∆ under the action of the ring of differential operators with constant coefficients. In the one variable case, a rational function of z with poles at most on z = 0 is written uniquely as φ(z) = Princ(φ)(z)+ψ(z) where Princ(φ)(z) = ∑ n...

Using the recent measurement of the total production rate for Bs and B ∗ s mesons in electron-positron annihilation to determine the strange quark mass parameter in the b̄ → Bs, B ∗ s fragmentation functions we calculate the momentum distributions of the Bs and B ∗ s mesons. Internet address: [email protected] Internet address: [email protected] Recently the probability for a heavy qu...

so that d(r, 0; ƒ') is the length of the segment on the w-plane between the image of the point 3 = 0 and the image of the point z = re. The lemma of Schwarz is the following: THEOREM 1. Let w=f(z) be analytic f or \z\ < 1 . If d(r,6;f)S 1 for all (r, 6) with r<l, then (1) d(r,0;f)gr and (2) | / ( 0 ) | ^ 1 . The sign of equality holds in (1) (for r^O) and in (2), if and only if \f(z) | = 1 ; th...

The goal of the paper is to develop a Heine-Stieltjes theory for univariate linear differential operators of higher order. Namely, for a given linear ordinary differential operator d(z) = Pk i=1Qi(z) d dzi with polynomial coefficients set r = maxi=1,...,k(degQi(z)− i). If d(z) satisfies the conditions: i) r ≥ 0 and ii) degQk(z) = k + r we call it a non-degenerate higher Lamé operator. Following...

and Applied Analysis 3 then, we have z 󸀠 (t) + z (t) ( d dt q (t)) ≥ −R (t) . (13) Multiplying the above inequality by eq(t) = Q(t), we get d dt (z (t) Q (t)) ≥ −Q (t) R (t) . (14) Consider now the integral on the interval [0, t] to obtain z (t) Q (t) ≥ z (0) − ∫ t 0 Q (s) R (s) ds, 0 ≤ t ≤ T, (15) so z (t) = 1 b (T) + x (t)

Let X be any partially ordered set, R any commutative ring, and T = I * (X,R) the weak incidence algebra of X over R. Let Z be a finite nonempty subset of X, L(Z) = {x ∈ X : x z for some z ∈ Z}, and M = Te Z. Various chain conditions on M are investigated. The results so proved are used to construct some classes of right perfect rings that are not left perfect.

In 1994, Becker conjectured that if $F(z)$ is a $k$-regular power series, then there exists a $k$-regular rational function $R(z)$ such that $F(z)/R(z)$ satisfies a Mahler-type functional equation with polynomial coefficients where the initial coefficient satisfies $a_0(z)=1$. In this paper, we prove Becker's conjecture in the best-possible form; we show that the rational function $R(z)$ can be...